Film gate



L. HORST.

FILM GATE.

APPLICATION FILED AUG-29,1921.

Patented Dec. 5, 1922.

772ver2 for Hitarn Patented Dec. 5, 1922."

7 "UNITED STATES I 1,437,895 PATENT OFFICE.)

LUDWIG HORST, 0F BERLIN-WILMERSDORF, GERMANY.

FILM GATE.

Application filed August 29, 1921. Serial No. 496,480.

To all'whom it may concern:

Be it known that I, LUDWIG Hons'r, a c1t1= zen of the German Republic, and a resident of-Berlin-Wilmersdorf, Germany, have inpolychromatic film-ribbons. can be guided the window of a projecting device,

along the projecting window in such a manner. that an absolutely exact coinciding of the individual pictures is insured and that the appearance of edges or borders in polychromatic projection is avoided in an effective manner.

The novel device is characterized substantially therein, that the film-ribbon is guided along'the projecting window as well in its direction of movement as in the direction, which is vertical to said direction of movement, by guiding rollers, which are arranged in pairs. A further characteristic feature is, thatone roller .of each pair is stationarily mounted, while the other roller can be displaced under the action ofa spring. According to the invention the rollers, engaging with the front side of the film ribon, are grooved on that part of their length, which is opposite to the icture proper, so that the pictures can not be injured during the passing movement of the film-ribbon.

In the accompanying drawing, in which one embodiment of the subject-matter of my the absolute coincidence of the individual invention is illustrated byway of example,

Fig. 1 is alongitudinal section through Fig. 2 is a section through the window, taken in a right angle to'the section of Fig. 1 and Fig. 3 is a cross-section through the window.

As it. can be seen clearly from Figs. 1 and 2. rollers g are arranged above and below the apertures of the window proper, which is indicated by a; of said rollers those, which are arranged on the left side of the film ribbon c are fixedly mounted. The oppositcly situated rollers. which are provided on the other side of the film-ribbon, are secured to bolts 71, which in their turn are connected to a plate 7'. The latter can be secured to the window by means of a screw is. which is provided with a milled head. The end of the bolt h'connected to the roller 9 is disposedin a recess, and near roller 9' the bolt It carries a collar, against which is abutting the end of a spring i abutting with its other end against the bottom of the said recessr As Is shown in 2, the rollers g are provided with V-shaped grooves at their circumference, in which groove the edge of the film ribbon e engages when pass- 'ing through the window. At the back side of the film ribbon (2 small rollers c are mounted intermediate the two roller pairs the said rollers 0 being fixed immovably to the rigid and stationary portion of the window. Opposite to the rollers c and positlioned in the turn-down part b of the winow are rollers (I, which are 'c ontin ually being pressed against the front side of the film ribbon e by the action 0f a spring f. As is shown clearly in the Figs. 1 and 3, the

rollers (Z are reduced in diameter in the mid;

dle section of their length, and as a result, they will engage only the edges of the film ribbon during its passage through thewindow. As isevident from Figs. 1 and 2, guiding rollerscl are journalled above and below the roller pairs 9 and at opposite sides of the film ribbon e, the said rollers (1 serving to guide the ribbon in a satisfactory manner'in its motion when entering and when leaving the window.

By means of the novel device the film ribbon e is guided in an effective and simple manner without fear of its singlepictures being injured and with the result, that, for instance, in projecting polychromatic films,

nature of my invention, what I claimns new and desire to secure by Letters Patent of the l nited States is:

1. A film gate comprising in combination, rollers arranged in pairs and adaptcd to guidethe film'ribbon along the winpos'sible to vary the details of springs.

dow in its direction of travel as Well as in the direction vertical to 'the direction of travel;

2. A film gate comprising, in combination, rollers arranged in pairs and adapted to guide the film ribbon along the window in the direction of its travel as well as in the direction vertical thereto, the

rollers adjoining the-back side of the film ribbon rigidly fixed in their position.

A film gate comprising, in combination, rollers arranged in pairs and adapted to guide the film ribbon along the I window in the direction of its travel as well as in the direction vertical thereto, the rollers adjoining the back side of the-film ribbon rigidly fixed in their position, the rollers on the front side of the film ribbon adapted to co-operate with the above said rollers.

4. A film gate comprising, in combination, rollers arranged in pairs and adapted to guide the said film ribbon along the window, the rollers on the front side of the film ribbon reduced in diameter along their middle portion opposite to the ictureproper, a door adapted to turn in inges, saidrollers on the front side of the, film ribbon disposed in said door-under action gate comprising, in combi- I nation, rollers arranged in pairs/and adapt ed to guide the said film ribbon along the a window and a roller pair each disposed above and below the apertures of the window,-said'roller pairs adapted to engage theredges of the film ribbon, of said rollers those in engagement with one lengthwise edge of the film ribbon fixed to bolts, a'fixingplate connected to said bolts, the latter provided with a collar near said rollers,

said collared bolts each positioned in a recessed part of the casing of the apparatus.

6. A film gate 'comprising, in combination, rollers arranged in pairs and-adapted to guide the said film ribbon along the the window, and a roller pair each disposed above and below the aperture of the window, said roller pairs adapted to engage the edges of the said'fihn ribbon,'th ose of said rollers engaging one edge of the film ribbon fixed to collared bolts, the springs on each of said bolts abuttingagainst the collar of said 

